Atoms, Elements and Periodic Table

Which particles make up MOST of the mass of an atom?

• protons and neutrons

• protons and electrons

• rotons and electrons

• electrons and molecules

The compound potassium sulfate, K₂SO_4, is composed of

• 2 atoms of potassium, 1 atom of sulfur, and 4 atoms of oxygen.

• 2 atoms of potassium, 4 atoms of sulfur, and 4 atoms of oxygen.

• two molecules of potassium and one molecule of sulfate.

• one molecule of potassium and two molecules of sulfate.

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The atomic number tells you what?

• number of electrons

• number of protons

• number of neutrons

• both electrons and protons in an atom.

What does the 1.00794 stand for?

• Hydrogen

• atomic number

• atomic mass

• atomic explosion

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NGSS.MS-PS1-1

How many protons are in Beryllium?

• 4

• 9

• 5

• 2

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What is the chemical symbol for Lithium?

• H

• He

• Li

• N

The number of protons is equal to 

• the atomic number

• the number of neutrons

• the energy levels

• the periodic table groups

The periodic table is organized into columns called _______ and rows called ______.

• groups and periods

• periods and groups

• categories and periods

• categories and groups

The chart that shows the arrangement of elements in order by their atomic number

• Electron Cloud

• Periodic Table

• amu

• Atomic Mass

What is the atomic mass of "F"

• 9

• 18

• 17

• 19

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NGSS.MS-PS1-1